Supported Metal Complexes

Hartley, F. R.

doi:10.1007/978-94-009-5247-8

Cited by 379 publications

(126 citation statements)

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“…However, homogeneous catalysts are difficult to be recovered from products [7,8]. Approaches for immobilization of homogeneous complex to solve this problem have been explored, which can broadly be grouped into two types.…”

Section: Introductionmentioning

confidence: 99%

The PPh3 ligand modified Rh/SiO2 catalyst for hydroformylation of olefins

Zhu¹,

Ding²,

Li³

et al. 2004

Catalysis Today

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Section: Introductionmentioning

confidence: 99%

The PPh3 ligand modified Rh/SiO2 catalyst for hydroformylation of olefins

Zhu¹,

Ding²,

Li³

et al. 2004

Catalysis Today

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“…A utilização dos chamados EQMs (eletrodos quimicamente modificados) tem possibilitado eletrooxidar o ácido ascórbico em potenciais consideravelmente mais baixos em relação aos eletrodos não modificados (DAUFARTAS; EVANS, 1980;ANDREOTTI;GUSHIKEM, 1992). A reação de oxidação de H 2 AA, ocorre segundo um processo eletroquímico -químico (uma reação de transferência de elétrons seguida de um processo de hidratação), no qual o ácido ascórbico é oxidado irreversivelmente a ácido dehidroascórbico hidratado (HARTLEY, 1985). Observa-se, pela Figura 6, que a oxidação do ácido ascórbico, com o uso do eletrodo de pasta de carbono modificado com SSFAM, ocorreu em 0,0 mV vs ECS.…”

Section: Resultsunclassified

Desenvolvimento de um novo sensor para ácido ascórbico

et al. 2006

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ResumoO compósito SiO 2 /SnO 2 /Fosfato, SSF, foi preparado pelo processo sol-gel. O corante redox azul de metileno foi imobilizado na superfície do SSF. Esse novo material foi utilizado na preparação de um eletrodo de pasta de carbono modificado (SSFAM) e suas características eletroquímicas foram estudadas pela técnica da voltametria cíclica. O sensor SSFAM apresentou um potencial formal de -90 mV vs ECS, uma excelente estabilidade quanto ao número de ciclos e quanto ao pH da solução de eletrólito suporte na faixa de 2,0 a 8,0. O sensor SSFAM foi utilizado para a determinação de ácido ascórbico (Vitamina C), com a utilização da técnica da cronoamperometria, e apresentou um tempo de resposta de 1,5 s, uma faixa linear de resposta entre 2,0 x 10 -4 e 3,0 x 10 -3 mol L , considerando uma relação sinal/ ruído = 3. Os resultados obtidos para amostras reais pelo sensor SSFAM foram comparados com os do método padrão de determinação de ácido ascórbico pelo reagente 2,6-diclorofenilindofenol. A comparação dos resultados obtidos pelos dois métodos demonstrou que o sensor SSFAM possui grande potencial de utilização. Palavras-chave: Sensor. Sol-gel. Ácido ascórbico. AbstractThe SiO 2 /SnO 2 /Phosphate composite, SSF, was prepared by the sol-gel process. The redox dye methylene blue was immobilized on the SSF surface. This new material was utilized in the preparation of a modified carbon paste electrode (SSFAM) and its electrochemical characteristics were studied by the cyclic voltammetry technique. The SSFAM sensor presented a formal potential of -90 mV vs SCE, excellent stability regarding the number of cycles and regarding the pH of electrolyte support solution ranging from 2.0 to 8.0. The SSFAM sensor was utilized for the determination of ascorbic acid (Vitamin C), utilizing the chronoamperometry technique, and presented a response time of 1.5 s, a linear response range between 2.0 x 10 -4 and 3.0 x 10 -3 mol L -1 , with a detection limit of 7.8 x 10 -6 mol L -1, considering a relation signal/noise = 3. The results obtained for real samples by the SSFAM sensor were compared with those from the standard method for determination of ascorbic acid by the 2,6-dichlorophenilindophenol. The comparison of the obtained results by the two methods demonstrated that the SSFAM sensor has great utilization potential.

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“…[8][9][10][11][12][13] In particular work by the Edelmann group has resulted in significant advancements in the synthesis of rare earth metal complexes supported by the…”

Section: Yttrium and Lanthanum Disiloxidesmentioning

confidence: 99%

Synthesis and structure of sterically overloaded tetra-coordinated yttrium and lanthanum disiloxides

McNerney

Mummadi

Hung‐Low

et al. 2016

Inorganic Chemistry Communications

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Synthesis and structure of sterically overloaded tetra-coordinated yttrium and lanthanum disiloxides, Inorganic Chemistry Communications (2016Communications ( ), doi: 10.1016Communications ( /j.inoche.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT Synthesis and Structure of Sterically Overloaded Tetra-coordinated Yttrium and Lanthanum DisiloxidesBrian McNerney [a] , Suresh Mummadi [a] , Fernando Hung-Low [a] , David B. Cordes [b] , Daniel K.Unruh [a] , Clemens Krempner* [a] [a] Department of Chemistry & Biochemistry, Texas Tech University, Box 1061, Lubbock, Texas, 79409-1061 In the past half century, rare earth metal siloxides [1] have gained some popularity primarily due to their potential as homogeneous catalysts in polymerization catalysis [2][3][4] , as precursors for the formation of metal oxides and silicates [5][6][7] , and as models for silica-supported lanthanide metal heterogeneous catalysts. [8][9][10][11][12][13] In particular work by the Edelmann group has resulted in significant advancements in the synthesis of rare earth metal complexes supported by the. [12][13][14][15][16][17][18][19][20] Our group recently synthesized a sterically overloaded silanediol of formula (CH 2 SiR 2 OH) 2 (1),where R = Si(SiMe 3 ) 2 Me, and demonstrated that its deprotonated form serves as a dianionic chelating spectator ligand for aluminum alkyls, hydroxides and alkoxides. [21] One of these complexes, a monomeric aluminum isopropoxide (Scheme 1) proved to be one of the most active MPV A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTcatalyst for the reduction of ketones and aldehydes reported so far. [22] Key to its high activty was its monomeric nature enforced by the bulkiness of the supporting disiloxide ligand. Based on these results, we reasoned that sterically overloaded disilanol 1 might be the ideal ligand for the synthesis of heteroleptic and salt-and adduct-free rare earth siloxide complexes, the latter potentially useful as Lewis acid catalysts.Scheme 1. Synthesis of sterically overloaded aluminum disiloxides.We first attempted to prepare the heteroleptic yttrium and lanthanum disiloxides of formula [(CH 2 R 2 SiO) 2 MN(SiMe 3 ) 2 ] (M = Ln, Y; R = SiMe(SiMe 3 ) 2 ) (2), respectively, as illustrated in Scheme 2. Initially, one equivalent of disilanol 1 was reacted with one equivalent of La(N(SiMe 3 ) 2 ) 3 in toluene as solvent. The reaction, however, did not give 2 but instead yielded the spirocyclic lanthanum disiloxide 3 as the main product irrespective whether toluene, THF or hexanes were used as solvents. Best yield...

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Supported Metal Complexes

Cited by 379 publications

References 0 publications

The PPh3 ligand modified Rh/SiO2 catalyst for hydroformylation of olefins

The PPh3 ligand modified Rh/SiO2 catalyst for hydroformylation of olefins

Desenvolvimento de um novo sensor para ácido ascórbico

Synthesis and structure of sterically overloaded tetra-coordinated yttrium and lanthanum disiloxides

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